Scattered UV irradiation during VISX excimer laser keratorefractive surgery

Lasers in Surgery and Medicine
R J HopeD H Sliney

Abstract

To evaluate the potential occupational health hazards associated with scattered ultraviolet (UV) radiation during photorefractive keratectomy (PRK) using the VISX Star S3 excimer laser. The Laser Vision Center, National Naval Medical Center, Bethesda, Maryland, USA. Intraoperative radiometric measurements were made with the Ophir Power/Energy Meter (LaserStar Model PD-10 with silicon detector) during PRK treatments as well as during required calibration procedures at a distance of 20.3 cm from the left cornea. These measurements were evaluated using a worst-case scenario for exposure, and then compared with the American Conference of Governmental Industrial Hygeinists (ACGIH) Threshold Value Limits (TVL) to perform a risk/hazard analysis. During the PRK procedures, the highest measured value was 248.4 nJ/pulse. During the calibration procedures, the highest measured UV scattered radiation level was 149.6 nJ/pulse. The maximum treatment time was 52 seconds. Using a worst-case scenario in which all treatments used the maximum power and time, the total energy per eye treated was 0.132 mJ/cm2 and the total UV radiation at close range (80 cm from the treated eye) was 0.0085 mJ/cm2. With a workload of 20 patients, the total occupatio...Continue Reading

References

May 1, 1997·Physics in Medicine and Biology·D H Sliney
Sep 1, 2005·Journal of Cataract and Refractive Surgery·Kraig S BowerDavid H Sliney

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Citations

Jul 27, 2010·Journal of Cataract and Refractive Surgery·Kraig S BowerDavid H Sliney
Jun 19, 2009·Current Opinion in Ophthalmology
Sep 28, 2019··David H. Sliney, David H. Sliney

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